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## Homework Statement

Assume an elastic collision (ignoring friction

and rotational motion).

A queue ball initially moving at 3.7 m/s

strikes a stationary eight ball of the same size

and mass. After the collision, the queue ball's

final speed is 2.1 m/s at an angle of theta with

respect to its original line of motion.

http://img506.imageshack.us/img506/3229/untitledjb3.png [Broken]

Find the eight ball's speed after the colli-

sion. Answer in units of m=s.

## Homework Equations

p=mv

possibly energy equations

## The Attempt at a Solution

This problem would've been a lot easier if the problem provided theta's value. Without theta i only managed to get to this:

3.7=2.1cos(theta)+Vx

where Vx is the x component of the 8 ball after collision

0=2.1sin(theta)+Vy

where Vy is the y component of the 8 ball after collision

should i find theta first? or can I find one of the component's value first and then find theta?

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